Obama officials failed to get new rules in Khadr tribunal

What is the correct definition of "murder in violation of the law of war", an offense punishable under the Military Commissions Act of 2009? Is there a difference between the tossed grenade in the Khadr trial and a missle strike launched by a civilian employee of the CIA? In the linked article, the CANWEST news service reports on divisions inside the U.S. Administration.